The ayurveda suggests that arthritis is caused primarily by an excess of ama and lack of agni. This can be caused by poor digestion and a weakened colon, resulting in the accumulation of undigested food and the buildup of waste matter. Poor digestion allows toxins to accumulate in the body, and problems with the colon allow the toxins to reach the joints.
So, the way to treat arthritis is to stimulate the digestive fire (agni) and to suppress the ama.
Ayurveda distinguishes three categories of arthritis, corresponding to vata, pitta, and kapha. To treat this condition properly, it is vital to carefully diagnose which type you have.